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Bipolar Landau Energy Levels Interact With Strongly Selective Carriers In Single-layer WSe2

- Dec 12, 2018 -

Recently, in Nat. Mater., Cory r. Dean of Columbia University (corresponding author) and his team published a paper entitled Ambipolar Landau levels and strong band-selective carrier interactions in monolayer WSe2. They used single-electron transistors to perform Landau level spectroscopy in WSe2. The electron structure diagram of single layer transition metal disulfide compound and hole are provided. They also found that landau energy levels differ significantly between the two bands and follow a unique sequence of valence bands governed by the strong zeeman effect. Seman's splitting in the valence band was several times more energetic than the cyclotron, far exceeding the predictions of the single-particle model, suggesting unusually strong multibody interactions and suggesting that WSe2 could be a candidate for new related electronics.

1

WSe2 in quantum hall system

a: momentum space illustration of the lowest energy band in WSe2;

b: the landau energy level in WSe2 is in the absence of multi-body interaction.

2

Detection scheme and bipolar landau energy level dispersion

a-b: diagram of experimental equipment;

c: inverse compression rate, d mu/dn, relation to charge density and magnetic field.

3

Polarization of landau energy levels

a: description of landau energy level structure in valence band

b: extraction of energy gap between chemical potential and landau energy level.

4

The landau gap in the valence band that is density-dependent

a: enlarged view of the gap size on landau energy level;

b: chemical potential

c: landau level gap relation in valence band.

5

Extract parameters and interactions

a: EZ/EN is used for the accessible density in VB and CB;

b-c: effective carrier mass and Landeg factor;

d-e: single particle model and landau energy level split by zeeman in the presence of interaction.